libavcodec/cfhddsp.c

   1 /*
   2  * Copyright (c) 2015-2016 Kieran Kunhya <kieran@kunhya.com>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/attributes.h"
  22 #include "libavutil/common.h"
  23
  24 #include "cfhddsp.h"
  25
  26 static av_always_inline void filter(int16_t *output, ptrdiff_t out_stride,
  27                           const int16_t *low, ptrdiff_t low_stride,
  28                           const int16_t *high, ptrdiff_t high_stride,
  29                           int len, int clip)
  30 {
  31     int16_t tmp;
  32     int i;
  33
  34     tmp = (11*low[0*low_stride] - 4*low[1*low_stride] + low[2*low_stride] + 4) >> 3;
  35     output[(2*0+0)*out_stride] = (tmp + high[0*high_stride]) >> 1;
  36     if (clip)
  37         output[(2*0+0)*out_stride] = av_clip_uintp2_c(output[(2*0+0)*out_stride], clip);
  38
  39     tmp = ( 5*low[0*low_stride] + 4*low[1*low_stride] - low[2*low_stride] + 4) >> 3;
  40     output[(2*0+1)*out_stride] = (tmp - high[0*high_stride]) >> 1;
  41     if (clip)
  42         output[(2*0+1)*out_stride] = av_clip_uintp2_c(output[(2*0+1)*out_stride], clip);
  43
  44     for (i = 1; i < len - 1; i++) {
  45         tmp = (low[(i-1)*low_stride] - low[(i+1)*low_stride] + 4) >> 3;
  46         output[(2*i+0)*out_stride] = (tmp + low[i*low_stride] + high[i*high_stride]) >> 1;
  47         if (clip)
  48             output[(2*i+0)*out_stride] = av_clip_uintp2_c(output[(2*i+0)*out_stride], clip);
  49
  50         tmp = (low[(i+1)*low_stride] - low[(i-1)*low_stride] + 4) >> 3;
  51         output[(2*i+1)*out_stride] = (tmp + low[i*low_stride] - high[i*high_stride]) >> 1;
  52         if (clip)
  53             output[(2*i+1)*out_stride] = av_clip_uintp2_c(output[(2*i+1)*out_stride], clip);
  54     }
  55
  56     tmp = ( 5*low[i*low_stride] + 4*low[(i-1)*low_stride] - low[(i-2)*low_stride] + 4) >> 3;
  57     output[(2*i+0)*out_stride] = (tmp + high[i*high_stride]) >> 1;
  58     if (clip)
  59         output[(2*i+0)*out_stride] = av_clip_uintp2_c(output[(2*i+0)*out_stride], clip);
  60
  61     tmp = (11*low[i*low_stride] - 4*low[(i-1)*low_stride] + low[(i-2)*low_stride] + 4) >> 3;
  62     output[(2*i+1)*out_stride] = (tmp - high[i*high_stride]) >> 1;
  63     if (clip)
  64         output[(2*i+1)*out_stride] = av_clip_uintp2_c(output[(2*i+1)*out_stride], clip);
  65 }
  66
  67 static void vert_filter(int16_t *output, ptrdiff_t out_stride,
  68                         const int16_t *low, ptrdiff_t low_stride,
  69                         const int16_t *high, ptrdiff_t high_stride,
  70                         int width, int height)
  71 {
  72     for (int i = 0; i < width; i++) {
  73         filter(output, out_stride, low, low_stride, high, high_stride, height, 0);
  74         low++;
  75         high++;
  76         output++;
  77     }
  78 }
  79
  80 static void horiz_filter(int16_t *output, ptrdiff_t ostride,
  81                          const int16_t *low, ptrdiff_t lstride,
  82                          const int16_t *high, ptrdiff_t hstride,
  83                          int width, int height)
  84 {
  85     for (int i = 0; i < height; i++) {
  86         filter(output, 1, low, 1, high, 1, width, 0);
  87         low    += lstride;
  88         high   += hstride;
  89         output += ostride * 2;
  90     }
  91 }
  92
  93 static void horiz_filter_clip(int16_t *output, const int16_t *low, const int16_t *high,
  94                               int width, int clip)
  95 {
  96     filter(output, 1, low, 1, high, 1, width, clip);
  97 }
  98
  99 static void horiz_filter_clip_bayer(int16_t *output, const int16_t *low, const int16_t *high,
 100                                     int width, int clip)
 101 {
 102     filter(output, 2, low, 1, high, 1, width, clip);
 103 }
 104
 105 av_cold void ff_cfhddsp_init(CFHDDSPContext *c, int depth, int bayer)
 106 {
 107     c->horiz_filter = horiz_filter;
 108     c->vert_filter = vert_filter;
 109
 110     if (bayer)
 111         c->horiz_filter_clip = horiz_filter_clip_bayer;
 112     else
 113         c->horiz_filter_clip = horiz_filter_clip;
 114
 115 #if ARCH_X86
 116     ff_cfhddsp_init_x86(c, depth, bayer);
 117 #endif
 118 }